#313F81#313F81

#313F81 is a dark, moderate blue. Relative luminance 0.058; OKLCH L 39.3% C 0.112 H 271.4°. Best body text is #FFFFFF at 9.73:1 contrast (WCAG AA passes).

Color values

HEX	#313F81
RGB	rgb(49, 63, 129)
HSL	hsl(230, 45%, 35%)
HSV	hsv(230, 62%, 51%)
CMYK	cmyk(62%, 51.2%, 0%, 49.4%)
CIE-LAB	lab(28.88, 16.18, -39.10)
CIE-LCH	lch(28.88, 42.32, 292.47°)
OKLab	oklab(39.3% 0.0027 -0.1118)
OKLCH	oklch(39.3% 0.112 271.4)
XYZ	xyz(7.0053, 5.7924, 21.5135)
Luminance	0.0579 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#313F81 #817331

analogous

#316781 #313F81 #4B3181

triadic

#313F81 #81313F #3F8131

tetradic

#313F81 #813167 #817331 #31814B

square

#313F81 #813167 #817331 #31814B

split-complementary

#313F81 #814B31 #678131

monochromatic

#0F1428 #202955 #313F81 #4255AD #6778C5

Accessibility & contrast

On white

9.73

#313F81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#313F81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #313F81

9.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##313F81	#FFFFFF	#000000	##FFFFFF
##313F81	1.00	9.73	2.16	9.73
#FFFFFF	9.73	1.00	21.00	1.00
#000000	2.16	21.00	1.00	21.00
##FFFFFF	9.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1D4883

Deuteranopia (green-blind)

#0D4180

Tritanopia (blue-blind)

#004E5A

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #313f81;
/* rgb */ color: rgb(49, 63, 129);
/* oklch */ color: oklch(39.3% 0.112 271.4);

Tailwind

colors: {
  custom: {
    50: '#7173a6',
    500: '#313f81',
    950: '#000000',
  },
}

SCSS

$custom: #313f81;
$custom-light: #7173a6;
$custom-dark: #000000;

JSON

{
  "hex": "#313f81",
  "rgb": {
    "r": 49,
    "g": 63,
    "b": 129
  },
  "hsl": {
    "h": 229.5,
    "s": 44.944,
    "l": 34.902
  },
  "oklch": {
    "l": 0.39298,
    "c": 0.11188,
    "h": 271.4
  },
  "luminance": 0.05793
}

Semantic roles & 50–950 ramp

primary

#313F81

secondary

#AD9F61

accent

#BE53D5

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#08080F

muted

#7B7B7F

Preview Lab

Preview with #313F81

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →